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The Journal of Environmental Psychology also suggests decorations are used to broadcast a household's friendliness.

Psychoanalyst Steve McKeown, founder of MindFixers and owner of The McKeown Clinic, told the site nostalgia plays a big part, with decorations evoking strong feelings of childhood and helping people to relive the magic.

Part of this is bringing back excitement, although it can also be a way of getting over past disappointments too.

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And Amy Morin, psychotherapist and author of 13 Things Mentally Strong People Don’t Do, said that Christmas decorations can also remind us of lost loved ones, or even when we still believed in Santa Claus ourselves.